projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/mach-pxa/pxa25x.c | |
| 3 | * | |
| 4 | * Author: Nicolas Pitre | |
| 5 | * Created: Jun 15, 2001 | |
| 6 | * Copyright: MontaVista Software Inc. | |
| 7 | * | |
| 8 | * Code specific to PXA21x/25x/26x variants. | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License version 2 as | |
| 12 | * published by the Free Software Foundation. | |
| 13 | * | |
| 14 | * Since this file should be linked before any other machine specific file, | |
| 15 | * the __initcall() here will be executed first. This serves as default | |
| 16 | * initialization stuff for PXA machines which can be overridden later if | |
| 17 | * need be. | |
| 18 | */ | |
| 19 | #include <linux/module.h> | |
| 20 | #include <linux/kernel.h> | |
| 21 | #include <linux/init.h> | |
| 22 | #include <linux/pm.h> | |
| 23 | ||
| 24 | #include <asm/hardware.h> | |
| 25 | #include <asm/arch/pxa-regs.h> | |
| 26 | ||
| 27 | #include "generic.h" | |
| 28 | ||
| 29 | /* | |
| 30 | * Various clock factors driven by the CCCR register. | |
| 31 | */ | |
| 32 | ||
| 33 | /* Crystal Frequency to Memory Frequency Multiplier (L) */ | |
| 34 | static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; | |
| 35 | ||
| 36 | /* Memory Frequency to Run Mode Frequency Multiplier (M) */ | |
| 37 | static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 }; | |
| 38 | ||
| 39 | /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */ | |
| 40 | /* Note: we store the value N * 2 here. */ | |
| 41 | static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 }; | |
| 42 | ||
| 43 | /* Crystal clock */ | |
| 44 | #define BASE_CLK 3686400 | |
| 45 | ||
| 46 | /* | |
| 47 | * Get the clock frequency as reflected by CCCR and the turbo flag. | |
| 48 | * We assume these values have been applied via a fcs. | |
| 49 | * If info is not 0 we also display the current settings. | |
| 50 | */ | |
| 51 | unsigned int get_clk_frequency_khz(int info) | |
| 52 | { | |
| 53 | unsigned long cccr, turbo; | |
| 54 | unsigned int l, L, m, M, n2, N; | |
| 55 | ||
| 56 | cccr = CCCR; | |
| 57 | asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) ); | |
| 58 | ||
| 59 | l = L_clk_mult[(cccr >> 0) & 0x1f]; | |
| 60 | m = M_clk_mult[(cccr >> 5) & 0x03]; | |
| 61 | n2 = N2_clk_mult[(cccr >> 7) & 0x07]; | |
| 62 | ||
| 63 | L = l * BASE_CLK; | |
| 64 | M = m * L; | |
| 65 | N = n2 * M / 2; | |
| 66 | ||
| 67 | if(info) | |
| 68 | { | |
| 69 | L += 5000; | |
| 70 | printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n", | |
| 71 | L / 1000000, (L % 1000000) / 10000, l ); | |
| 72 | M += 5000; | |
| 73 | printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", | |
| 74 | M / 1000000, (M % 1000000) / 10000, m ); | |
| 75 | N += 5000; | |
| 76 | printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", | |
| 77 | N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5, | |
| 78 | (turbo & 1) ? "" : "in" ); | |
| 79 | } | |
| 80 | ||
| 81 | return (turbo & 1) ? (N/1000) : (M/1000); | |
| 82 | } | |
| 83 | ||
| 84 | EXPORT_SYMBOL(get_clk_frequency_khz); | |
| 85 | ||
| 86 | /* | |
| 87 | * Return the current memory clock frequency in units of 10kHz | |
| 88 | */ | |
| 89 | unsigned int get_memclk_frequency_10khz(void) | |
| 90 | { | |
| 91 | return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000; | |
| 92 | } | |
| 93 | ||
| 94 | EXPORT_SYMBOL(get_memclk_frequency_10khz); | |
| 95 | ||
| 96 | /* | |
| 97 | * Return the current LCD clock frequency in units of 10kHz | |
| 98 | */ | |
| 99 | unsigned int get_lcdclk_frequency_10khz(void) | |
| 100 | { | |
| 101 | return get_memclk_frequency_10khz(); | |
| 102 | } | |
| 103 | ||
| 104 | EXPORT_SYMBOL(get_lcdclk_frequency_10khz); |